Aqueous suspensions of cross-linked silicone particles, aqueous emulsions of oil containing cross-linked silicone particles, and cosmetic raw material

ABSTRACT

Aqueous suspensions of cross-linked silicone particles comprising: (A) cross-linked silicone particles with an average particle size of from 0.1 to 500 μm, (B) N-acyl-, N-hydrocarbon taurines and/or their salts, and (C) water, aqueous emulsions of oil containing cross-linked silicone particles comprising: (A) cross-linked silicone particles with an average particle size of from 0.1 to 500 μm, (D) oil, (B) N-acyl-, N-hydrocarbon taurines and/or their salts, and (C) water, with component (A) contained in droplets of component (D) dispersed in water, and cosmetic raw materials comprising said aqueous suspensions or said aqueous emulsions. The suspensions and emulsions are characterized by superior stability and by low environmental impact and minimal effects on the human body. In addition, they are extremely useful as cosmetic raw materials because of their superior cosmetics functionality such as wetness and smoothness.

TECHNICAL FIELD

The present invention relates to aqueous suspensions of cross-linkedsilicone particles, aqueous emulsions of oil containing cross-linkedsilicone particles, and cosmetic raw materials. More specifically, itrelates to aqueous suspensions of cross-linked silicone particles,aqueous emulsions of oil containing cross-linked silicone particles, andcosmetic raw materials of superior stability, low environmental impactand minimal effects on the human body.

BACKGROUND ART

Aqueous suspensions of cross-linked silicone particles composed ofcross-linked silicone particles, surface active agents, and water, aswell as aqueous emulsions of oil containing cross-linked siliconeparticles have been known in the past (see Japanese Unexamined PatentApplication Publication No. Sho 63-309565, Japanese Unexamined PatentApplication Publication No. Hei 11-140191, and Japanese UnexaminedPatent Application Publication No. 2000-281903).

In addition, when added to water-base paints, such suspensions produce adelustered dry paint layer (see Japanese Unexamined Patent ApplicationPublication No. Hei 5-9409), and it has been suggested that using themin water-base cosmetic produces improved sensory properties (seeJapanese Unexamined Patent Application Publication No. Hei 10-139624 andJapanese Unexamined Patent Application Publication No. Hei 10-175816).

Nonionic surface active agents, anionic surface active agents, cationicsurface active agents, and amphoteric surface active agents, or surfaceactive agents made up of their mixtures are used in such aqueoussuspensions and aqueous emulsions, with alkyl polyethers and othernonionic surface active agents being preferable due to the excellentdispersibility of the cross-linked silicone particles and oilscontaining cross-linked silicone particles obtained when such agents areused for cosmetic applications.

In recent years, it has been required that surface active agents of lowenvironmental impact be selected for use in such aqueous suspensions andaqueous emulsions while at the same time ensuring their improvedstability and dispersibility in mixtures. For instance, chemicalsubstances of environmental concern such as alkyl polyethers bearingC_(12˜15) alkyl groups are recognized as designated PRTR (PollutantRelease and Transfer Register) chemical substances whose release volumesetc. have been subject to monitoring. In addition, according to aNotification from the Head of the Pharmaceutical and Medical SafetyBureau of the Ministry of Health, Labour and Welfare entitled “Onassuring the quality and safety of medicines etc. manufactured using rawmaterials of bovine origin” (Dec. 12, 2000), restrictions are still ineffect on the cosmetics use of surface active agents derived from animalfats using raw materials such as beef tallow etc. and especially animalfat-derived surface active agents with alkyl groups.

As a result of in-depth investigations aimed at eliminating theabove-described problems, the present inventors arrived at the presentinvention by discovering that the above-described problems can beeliminated by selecting specific N-acyl-, N-hydrocarbon taurines and/ortheir salts as surface active agents for use in aqueous suspensions ofcross-linked silicone particles and aqueous emulsions of oil containingcross-linked silicone particles.

Namely, it is an object of the present invention to provide aqueoussuspensions of cross-linked silicone particles and aqueous emulsions ofoil containing cross-linked silicone particles possessing superiorstability, low environmental impact and minimal effects on the humanbody, as well as cosmetic raw materials utilizing said aqueoussuspensions and aqueous emulsions.

DISCLOSURE OF THE INVENTION

The present invention relates to aqueous suspensions of cross-linkedsilicone particles comprising:

(A) cross-linked silicone particles with an average particle size offrom 0.1 to 500 μm,

(B) N-acyl-, N-hydrocarbon taurines represented by the general formula(I);

(where R¹ and R² stand for unsubstituted or substituted monovalenthydrocarbon groups) and/or their salts, and(C) water,and to cosmetic raw materials comprising said aqueous suspensions, aswell as to aqueous emulsions of oils containing cross-linked siliconeparticles comprising:(A) cross-linked silicone particles with an average particle size offrom 0.1 to 500 μm,(D) oil,(B) N-acyl-, N-hydrocarbon taurines represented by the general formula(I);

(where R¹ and R² stand for unsubstituted or substituted monovalenthydrocarbon groups) and/or their salts, and(C) water,with component (A) contained in droplets of component (D) dispersed inwater,and to cosmetic raw materials comprising said aqueous emulsions.

DETAILED DESCRIPTION OF THE INVENTION

First of all, explanations are provided regarding the inventive aqueoussuspensions of cross-linked silicone particles.

The cross-linked silicone particles (A) constitute the principalcomponent of the inventive suspensions, their average particle sizebeing from 0.1 to 500 μm, preferably from 0.1 to 100 μm, even morepreferably from 0.1 to 50 μm, and especially preferably from 0.5 to 50μm. This is due to the fact that cross-linked silicone particles whoseaverage particle size is below the lower limits of the above-mentionedranges are difficult to prepare, and, on the other hand, when the sizeexceeds the upper limits of the above-mentioned ranges, thedispersibility of the suspensions in cosmetic, paint, etc. tends todecrease. The shape of component (A) may be, for instance, spherical,oblate, or irregular, with the spherical shape being more preferable dueto the particularly high dispersibility of the resultant suspensions incosmetic, paint, etc. In addition, the consistency of component (A) maybe, for instance, similar to that of hard rubber, soft rubber, or gel.

More specifically, hydrosilylation reaction-crosslinkable siliconecompositions, condensation reaction-crosslinkable silicone compositions,organic peroxide-crosslinkable silicone compositions, andUV-crosslinkable silicone compositions are suggested as thecross-linkable silicone compositions used in the preparation ofcomponent (A). Among them, hydrosilylation reaction-crosslinkablesilicone compositions and condensation reaction-crosslinkable siliconecompositions are preferable.

Compositions containing organopolysiloxanes having at least two alkenylgroups per molecule, organohydrogenpolysiloxanes having at least twosilicon-bonded hydrogen atoms per molecule, and platinum catalysts astheir main ingredients are suggested as examples of the hydrosilylationreaction-crosslinkable silicone compositions.

Compositions, whose main ingredients include organopolysiloxanes having,per molecule, at least two hydrolysable groups such as aminoxy, acetoxy,oxime, alkoxy, or hydroxyl groups bonded to silicon atoms, silanecross-linking agents having, per molecule, at least three hydrolysablegroups such as aminoxy, acetoxy, oxime, and alkoxy bonded to siliconatoms, and condensation reaction catalysts, such as organotin ororganotitanium compounds, are suggested as examples of the condensationreaction-crosslinkable silicone compositions. Preferably, these aresilicone compositions crosslinkable by the de-alcoholation condensationreaction, whose main ingredients include organopolysiloxanes having, permolecule, at least two alkoxy groups or hydroxyl groups bonded tosilicon atoms, silane crosslinking agents having, per molecule, at leastthree alkoxy groups bonded to silicon atoms, and condensation reactioncatalysts such as organotin compounds, organotitanium compounds, etc.

In addition, component (A) may contain non-crosslinkable oils. There areno particular limitations on the oils, with suggested oils includingsilicone oils and organic oils. The molecular structure of thenon-crosslinkable silicone oils could be, for instance, linear,partially branched linear, cyclic, or branched, with linear and cyclicstructures being particularly preferable. For instance,dimethylpolysiloxanes having both ends of the molecular chain blocked bytrimethylsiloxy groups, cyclic dimethylsiloxanes, silicone oils obtainedby substituting ethyl, propyl, butyl, and other alkyl groups, phenylgroups, or 3,3,3-trifluoropropyl groups for some of the methyl groups ofthe above-mentioned silicone oils, as well as mixtures of theabove-mentioned silicone oils are suggested as such silicone oils.Suggested examples of the non-crosslinkable organic oils include, forinstance, liquid paraffin, isoparaffin, hexyl laurate, isopropylmyristate, myristyl myristate, cetyl myristate, 2-octyldodecylmyristate, isopropyl palmitate, 2-ethylhexyl palmitate, butyl stearate,decyl oleate, 2-octyldodecyl oleate, myristyl lactate, cetyl lactate,lanolin acetate, stearyl alcohol, cetostearyl alcohol, oleyl alcohol,avocado oil, almond oil, olive oil, cacao oil, jojoba oil, sesame oil,safflower oil, soybean oil, tsubaki oil, squalane, persic oil, castoroil, cottonseed oil, coconut oil, polypropylene glycol monooleate,neopentyl glycol-2-ethylhexanoate, isostearic acid triglyceridess,coconut oil fatty acid triglycerides, polyoxyethylene lauryl ether, andpolyoxypropylene cetyl ether. Of the above, silicone oils are preferabledue to their superior affinity to the cross-linked silicone particles.Their viscosity at 25° C. is preferably not more than 100,000 mm²/s,more preferably, not more than 50,000 mm²/s, and especially preferably,not more than 10,000 mm²/s. Although there are no limitations on thecontent of the non-crosslinkable oils used in component (A), theircontent is preferably not more than 50% by weight, more preferably, notmore than 30% by weight, and even more preferably, not more than 10% byweight. This is due to the fact that when their content exceeds 50% byweight, component (A) cannot hold any more of the non-crosslinkable oilsand there is chance that this may lead to the formation of the aqueousemulsions of oil containing cross-linked silicone particles describedbelow. Cross-linked silicone particles containing such non-crosslinkableoils can be prepared by combining the aforementioned cross-linkablesilicone compositions with non-crosslinkable oils and usingorganopolysiloxanes containing low molecular weight siloxane oligomersas a raw material for the cross-linkable silicone compositions.

Although there are no limitations on the content of component (A) in thesuspensions of the present invention, the content is preferably from 25to 80% by weight, and even more preferably, from 40 to 80% by weight.This is due to the fact that when the content of component (A) is belowthe lower limits of the above-mentioned ranges, the scope of uses of thesuspensions may be limited, and, on the other hand, when the contentexceeds the upper limits of the above-mentioned ranges, its propertiesduring handling and use deteriorate and its dispersibility in cosmetic,paint, etc. tends to decrease.

(B) N-acyl-, N-hydrocarbon taurines and/or their salts constitute acharacteristic component of the present invention used as a surfaceactive agent. In addition, not only does the component improve thestability of the suspensions, but it also improves their dispersibilityand stability in combinations with other components; besides, it isfriendly to the environment and to the human body. Component (B)consists of N-acyl-, N-hydrocarbon taurines represented by the generalformula (I);

and/or their salts. In the formula above, R¹ and R² are unsubstituted orsubstituted monovalent hydrocarbon groups specifically exemplified bymethyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, decyl,dodecyl, myristyl, palmityl, stearyl, and other alkyl groups; vinyl,allyl, hexenyl, oleyl, and other alkenyl groups; cyclopentyl,cyclohexyl, and other cycloalkyl groups; phenyl, tolyl, naphthyl, andother aryl groups. R¹ and R² may be identical or different, with alkyl,alkenyl, or cycloalkyl groups being preferable, and alkenyl or alkylgroups with from 5 through 30 carbon atoms even more preferable in caseof R¹. R² is preferably an alkyl group, usually methyl. The term N-acyltaurines generally refers to compounds, in which hydrogen atoms arebonded to nitrogen atoms according to the formula above (compounds, inwhich R² stands for a hydrogen atom), with the N-acyl-, N-hydrocarbontaurines of the present invention characterized by nitrogen-bonded acylgroups and monovalent hydrocarbon groups. In addition, the salts of suchN-acyl-, and N-hydrocarbon taurines are formed by neutralizing them withalkaline substances such as sodium hydroxide, potassium hydroxide andother alkali metal hydroxides; sodium carbonate and other weak acidsalts of alkali metals; ammonia, triethanolamine, ammonium hydroxide,and other water-soluble amines; basic amino acids; taurine salts. Thetaurine salts used as neutralizing agents are represented by the generalformula;

(where R³ stands for a hydrogen atom or an alkyl group, and M is analkali metal) and are specifically exemplified by compounds representedby the following formulae.

Component (B) is exemplified by sodium N-lauroyl methyl taurine, sodiumN-myristoyl methyl taurine, sodium N-oleoyl methyl taurine, sodiumN-stearoyl methyl taurine, sodium N-coconut fatty acid methyl taurine,potassium N-coconut fatty acid methyl taurine, magnesium N-coconut fattyacid methyl taurine, sodium N-palmitoyl methyl taurine, potassiumN-stearoyl methyl taurine, potassium N-cetyloyl methyl taurine andnon-neutralized products thereof. The above-mentioned compounds can beused singly or as mixtures combining several components.

Although there are no limitations on the content of component (B) in thesuspension of the present invention, the content is preferably from0.001 to 20% by weight, and especially preferably, from 0.01 to 10% byweight. This is due to the fact that when the content of component (B)is below the lower limits of the above-mentioned ranges, thedispersibility of the suspensions in cosmetic, paint, etc. tends todeteriorate, and, on the other hand, when the content exceeds the upperlimits of the above-mentioned ranges, the scope of their uses may belimited.

Component (C), i.e. water, which serves as the dispersion medium forcomponent (A), may be, for instance, demineralized water or ion exchangewater. Although there are no limitations on the content of component (C)in the suspension of the present invention, the content is preferablyfrom 5 to 75% by weight, and especially preferably, from 10 to 60% byweight.

Furthermore, phenoxyethanol, ethanol, i-propanol, t-butanol, ethyleneglycol, propylene glycol, diethylene glycol, and other alcohols;carboxyvinyl polymers, sodium carboxymethyl cellulose, and otherwater-soluble polymers; amino-containing silicones, polyether-containingsilicones, and other organosilicon compounds, and, in addition,antiseptic agents, antimicrobial agents, anti-fungal agents,anticorrosive agents, fragrances, and pigments can be combined with thesuspensions of the present invention as optional components. Inaddition, so long as the purpose of the present invention is notimpaired, in order to improve the stability of the suspensions inmixtures with other components, they may be combined with varioussurface active agents other than non-ionic surface active agents, suchas anionic surface active agents, cationic surface active agents, andamphoteric surface active agents. The components may be used singly oras combinations of several components. In addition, there are noparticular limitations on the order, in which they are to be combined.

There are no limitations on the methods used to prepare the suspensionsof the present invention, with suggested techniques including, forinstance, adding and dispersing the above-mentioned cross-linkablesilicone compositions in an aqueous solution-made up of component (B),component (C), and other optional components, and then cross-linkingsaid compositions, or adding and dispersing silicone compositionsobtained by removing crosslinking catalysts from the above-mentionedcross-linkable compositions to an aqueous solution made up of component(B), component (C), and other optional components and then cross-linkingthe above-mentioned compositions by adding the above-mentionedcatalysts. In the latter technique, it is preferable to add thecross-linking catalyst after first dispersing it in an aqueous solutionof component (B).

Next, detailed explanations are provided regarding the inventive aqueousemulsions of oil containing cross-linked silicone particles.

Cross-linked silicone particles (A) constitute the principal componentof the inventive emulsion, with their average particle size being from0.1 to 500 μm, preferably from 0.1 to 100 μm, even more preferably from0.1 to 50 μm, and especially preferably from 0.5 to 50 μm. This is dueto the fact that cross-linked silicone particles whose average particlesize is below the lower limits of the above-mentioned ranges aredifficult to prepare, and, on the other hand, when the average particlesize exceeds the upper limits of the above-mentioned ranges, thestability of the emulsions tends to decrease. The shape of component (A)may be, for instance, spherical, oblate, or irregular, with thespherical shape being more preferable among them. In addition, theconsistency of component (A) may be, for instance, similar to that ofhard rubber, soft rubber, or gel.

Hydrosilylation reaction-crosslinkable silicone compositions,condensation reaction-crosslinkable silicone compositions, organicperoxide-crosslinkable silicone compositions, and UV-crosslinkablesilicone compositions are suggested as examples of the cross-linkablesilicone compositions used in the preparation of component (A) for usein the emulsions of the present invention. Among them, hydrosilylationreaction-crosslinkable silicone compositions and condensationreaction-crosslinkable silicone compositions, exemplified by the samecompositions as those described above, are preferable.

(D) oil is also a major ingredient of the emulsions of the presentinvention and while there are no particular limitations on thiscomponent, suggested oils include silicone oils and organic oils,exemplified by the same non-crosslinkable oils as those mentioned above.Of these, silicone oils are preferable due to their superior affinity tothe cross-linked silicone particles. In addition, their viscosity at 25°C. is preferably not more than 100,000 mm²/s, more preferably, not morethan 50,600 mm²/s, and especially preferably, not more than 10,000mm²/s. Component (D) is dispersed in water in the form of dropletscontaining (A) cross-linked silicone particles. Consequently, theaverage size of the droplets of component (D) is larger than that ofcomponent (A); specifically, it is, preferably, between 0.5 and 1,000μm, and even more preferably, between 1 and 1,000 μm.

There are no limitations on the content of component (D), and while itis dependent on the oil absorbency of component (A), the weight ofcomponent (D) is preferably greater than 50% by weight, and especiallypreferably, is not less than 60% by weight relative to the combinedweight of component (A) and component (D). This is due to the concernthat if the content of component (D) is 50% by weight or lower, it mayend up contained in component (A), and it may be impossible to introducecomponent (A) in component (D).

While there are no limitations on the content of component (D) andcomponent (A) in the emulsions of the present invention, i.e. there areno limitations on the content of the oil droplets containingcross-linked silicone particles, the content is preferably in the rangeof from 25 to 90% by weight, and even more preferably, from 40 to 80% byweight. This is due to the fact that when the content is below the lowerlimits of the above-mentioned ranges, the scope of uses of the emulsionsmay be limited, and, on the other hand, when it exceeds the upper limitsof the above-mentioned ranges, their properties during handling and usedeteriorate and their dispersibility in cosmetic, paint, etc. tends todecrease.

(B) N-acyl-, N-hydrocarbon taurines and/or their salts are acharacteristic component of the present invention used a surface activeagent. In addition, not only does this component improve the stabilityof the inventive emulsion, but it also improves its dispersibility andstability when combined with other components; besides, it is friendlyto the environment and the human body. The same specific compounds asthose mentioned above are suggested.

Although there are no limitations on the content of component (B) in theemulsions of the present invention, the content is preferably from 0.001to 20% by weight, and especially preferably, from 0.01 to 10% by weight.This is due to the fact that when the content of component (B) is belowthe lower limits of the above-mentioned ranges, the dispersibility ofthe emulsions in cosmetic, paint, etc. tends to deteriorate, and, on theother hand, when the content exceeds the upper limits of theabove-mentioned ranges, the scope of their uses may be limited.

Component (C), i.e. water, which serves as the dispersion medium, maybe, for instance, demineralized water or ion exchange water. Althoughthere are no limitations on the content of component (C) in theemulsions of the present invention, the content is preferably from 5 to75% by weight, and, especially preferably, from 10 to 60% by weight.

Furthermore, phenoxyethanol, ethanol, i-propanol, t-butanol, ethyleneglycol, propylene glycol, diethylene glycol, and other alcohols;carboxyvinyl polymers, sodium carboxymethyl cellulose, and otherwater-soluble polymers; amino-containing silicones, polyether-containingsilicones, and other organosilicon compounds, and, in addition,antiseptic agents, antimicrobial agents, anti-fungal agents,anticorrosive agents, fragrances, and pigments can be combined with theemulsions of the present invention as optional components.

In addition, as long as the purpose of the present invention is notimpaired, in order to improve the stability of the emulsions in mixtureswith other components, it may be combined with various surface activeagents such as anionic surface active agents, cationic surface activeagents, amphoteric surface active agents, and nonionic surface activeagents. The components may be used singly or as combinations of severalcomponents. In addition, there are no particular limitations on theorder, in which they are to be combined.

There are no limitations on the methods used in the preparation of theemulsions of the present invention, with suggested techniques including,for instance, adding and dispersing cross-linkable silicone compositionscontaining component (D) in an aqueous solution made up of component(B), component (C), and other optional components, and thencross-linking the above-mentioned compositions; or adding and dispersingsilicone compositions obtained by removing crosslinking catalysts fromthe above-mentioned cross-linkable compositions containing component (D)in an aqueous solution made up of component (B), component (C), andother optional components and then cross-linking the above-mentionedcompositions by adding the above-mentioned catalysts. In the lattertechnique, it is preferable to add the cross-linking catalyst afterfirst dispersing it in an aqueous solution of component (B).

The inventive aqueous suspensions and aqueous emulsions described aboveare characterized by superior stability as well as by low environmentalimpact and minimal effects on the human body. Furthermore, they areuseful as raw materials for cosmetic and raw materials for paint becauseof their excellent stability in mixtures and dispersibility in cosmetic,paint, etc. and their ability to provide the full effects of addingcross-linked silicone particles when they are mixed with cosmetic orpaint. In particular, they are extremely suitable as silicone rawmaterials mixed with cosmetic because they possess superior cosmeticfunctionality, such as wetness and smoothness, along with superiorcompatibility with the human body.

Next, explanations are provided regarding the cosmetic raw materials ofthe present invention.

The cosmetic raw materials of the present invention comprise theabove-described aqueous suspensions or aqueous emulsions, and othersilicone emulsion-based components known as additives for cosmetic rawmaterials can be combined with them so long as the object of the presentinvention is not impaired. Anticorrosive agents, anti-fungal agents,antiseptic agents, pH adjusting agents, nonionic surface active agents,and anionic surface active agents other than component (B), etc. aresuggested as such additives. Such components can be used singly or as acombination of several components. There are no particular limitationson the order, in which they are to be combined. The content of theabove-described aqueous suspensions and aqueous emulsions in thecosmetic raw materials of the present invention is preferably from 30 to100% by weight, and, even more preferably, from 50 to 100% by weight.

Diethanolamine N-acyl-L-glutamate, triethanolamine N-acyl-L-glutamate,sodium N-acyl-L-glutamate, sodium alkane sulfonate, ammonium alkyl (12,14, 16) sulfate, triethanolamine (1) alkyl (11, 13, 15) sulfate,triethanolamine (2) alkyl (11, 13, 15) sulfate, triethanolamine alkyl(12 through 14) sulfate, triethanolamine alkyl sulfate solution, sodiumalkyl (12, 13) sulfate, sodium alkyl sulfate solution, sodiumisethionate, sodium lactoisostearate, disodium undecylenoyl amidoethylsulfosuccinate, triethanolamine sulfooleate, sodium sulfooleate,disodium oleamido sulfosuccinate, potassium oleate, sodium oleate,morpholine oleate, oleyl sarcosine, sodium methyl oleoyl taurine,potassium-containing soap base, potassium soap base solution, potassiumsoap, carboxylated polyoxyethylene tridodecyl ether, sodiumpolyoxyethylene tridodecyl ether carboxylate (3 E.O.), triethanolamineN-hydrogenated tallow acyl-L-glutamate, sodium N-hydrogenated tallowacyl-L-glutamate, sodium hydrogenated coconut oil fatty acid glycerylsulfate, sodium diundecylenoyl amidoethyl sulfosuccinate, sodium stearylsulfate, potassium stearate, triethanolamine stearate, sodium stearate,sodium N-stearoyl-L-glutamate, disodium stearoyl-L-glutamate, sodiumdioctyl sulfosuccinate, sodium dioctyl sulfosuccinate solution, disodiumpolyoxyethylene monooleylamide sulfosuccinate solution (2 E.O.),disodium polyoxyethylene lauroyl ethanolamide sulfosuccinate solution (5E.O.), disodium lauryl sulfosuccinate, diethanolamide cetyl sulfate,sodium cetyl sulfate, soap base, sodium cetostearyl sulfate,triethanolamine tridecyl sulfate, potassium palmitate, sodium palmitate,sodium methyl palmitoyl taurine, sodium ricinoleate solution (30%),polyoxyethylene alkyl ether sulfate solution (3 E.O.), diethanolaminepolyoxyethylene alkyl (12, 13) ether sulfate solution (3 E.O.),triethanolamine polyoxyethylene alkyl ether sulfate solution (3 E.O.),triethanolamine polyoxyethylene alkyl (11, 13, 15) ether sulfate (1E.O.), triethanolamine polyoxyethylene alkyl (12, 13) ether sulfate (3E.O.), sodium polyoxyethylene alkyl ether sulfate solution (3 E.O.),sodium polyoxyethylene alkyl (11, 13, 15) ether sulfate (1 E.O.), sodiumpolyoxyethylene alkyl (11 through 15) ether sulfate (3 E.O.), sodiumpolyoxyethylene alkyl (12, 13) ether sulfate (3 E.O.), sodiumpolyoxyethylene alkyl (12 through 14) ether sulfate (3 E.O.), sodiumpolyoxyethylene alkyl (12 through 15) ether sulfate (3 E.O.), disodiumpolyoxyethylene alkyl (12 through 14) sulfosuccinate (7 E.O.), sodiumpolyoxyethylene undecyl ether sulfate, sodium polyoxyethylene octylphenyl ether sulfate solution, ammonium polyoxyethylene oleyl ethersulfate, disodium polyoxyethylene lauryl sulfosuccinate, sodiumpolyoxyethylene nonyl phenyl ether sulfate, sodium polyoxyethylenepentadecyl ether sulfate, triethanolamine polyoxyethylene myristyl ethersulfate, sodium polyoxyethylene myristyl ether sulfate, sodiumpolyoxyethylene myristyl ether sulfate (3 E.O.), sodium polyoxyethylenelauryl ether acetate (16 E.O.) solution, ammonium polyoxyethylene laurylether sulfate (2 E.O.), triethanolamine polyoxyethylene lauryl ethersulfate, sodium polyoxyethylene lauryl ether sulfate, diethanolaminemyristyl sulfate, sodium myristyl sulfate, potassium myristate, sodiumN-myristoyl-L-glutamate, sodium myristoyl methylaminoacetate, sodiummyristoyl methyl-β-alanine solution, sodium myristoyl methyl taurine,medicinal soap, triethanolamine-magnesium coco-alkyl sulfate,triethanolamine N-coco acyl-L-glutamate, sodium N-coco acyl-L-glutamate,sodium coco-ethyl ester sulfonate, potassium cocoate, potassium cocoatesolution, sodium N-coco hydrogenated tallow acyl-L-glutamate, sarcosinecocoate, triethanolamine sarcosine cocoate, sodium sarcosine cocoate,triethanolamine cocoate, triethanolamine cocoate solution, sodiumcocoate, sodium methyl alanine cocoate, sodium methyl alanine cocoatesolution, potassium methyl taurine cocoate, sodium methyl taurinecocoate, sodium undecylaminodipropionate, sodium laurylaminodipropionatesolution (30%), sodium lauryl sulfoacetate, sodium laurylbenzenesulfonate, laurylsulfuric acid, ammonium laurylsulfonate,potassium laurylsulfonate, diethanolamine laurylsulfonate,triethanolamine laurylsulfonate, sodium laurylsulfonate, magnesiumlaurylsulfonate, monoethanolamine lauryl sulfonate, potassium laurate,triethanolamine laurate, triethanolamine laurate solution, sodiumlaurate, triethanolamine myristate-laurate, triethanolaminelauroyl-L-glutamate, sodium N-lauroyl-L-glutamate, lauroyl sarcosine,potassium lauroyl sarcosine, triethanolamine lauroyl sarcosine solution,sodium lauroyl sarcosine, sodium lauroyl methyl-β-alanine solution,sodium lauroyl methyl taurine, and sodium lauroyl methyl taurinesolution are suggested as specific examples of the anionic surfaceactive agents.

Ethylene glycol fatty acid ethyl esters, polyethylene glycol fatty acidesters, propylene glycol fatty acid esters, polypropylene glycol fattyacid esters, glycol fatty acid esters, trimethylolpropane fatty acidesters, pentaerythritol fatty acid esters, glucoside derivatives,glycerol alkyl ether fatty acid esters, trimethylolpropane oxyethylenealkyl ethers, fatty acid amides, alkylolamides, alkylamine oxides,lanolin and its derivatives, castor oil derivatives, hydrogenated castoroil derivatives, sterols and their derivatives, polyoxyethylene alkylethers, polyoxyethylene alkyl allyl ethers, polyoxyethylene alkylamines, polyoxyethylene fatty acid amides, polyoxyethylenealkylolamides, polyoxyethylene diethanolamine fatty acid esters,polyoxyethylene trimethylolpropane fatty acid esters, polyoxyethylenealkyl ether fatty acid esters, polyoxyethylene polyoxypropylene glycols,polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylenepolyoxypropylene polyhydric alcohol ethers, glycerol fatty acid esters,polyglycerol fatty acid esters, polyoxyethylene glycerol fatty acidesters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acidesters, and sucrose fatty acid esters are suggested as specific examplesof the nonionic surface active agents.

Hydrochloric acid, sulfuric acid, phosphoric acid, diammonium hydrogenphosphate, disodium hydrogen phosphate, dipotassium hydrogen phosphate,ammonium dihydrogen phosphate, sodium dihydrogen phosphate, potassiumdihydrogen phosphate, trisodium phosphate, tripotassium phosphate,acetic acid, ammonium acetate, sodium acetate, potassium acetate, citricacid, sodium citrate, ammonium citrate, sodium carbonate, potassiumcarbonate, ammonium carbonate, sodium hydrogen carbonate, ammoniumhydrogen carbonate, sodium hydroxide, potassium hydroxide, ammonia, andtriethanolamine are suggested as specific examples of the pH-adjustingagents.

Benzoic acid, aluminum benzoate, sodium benzoate, isopropyl methylphenol, ethyl hexanediol, lysozyme chloride, chlorhexidine chloride,octyl phenoxyethanol, ortho-phenyl phenol, sodium perborate,photosensitive material No. 101, photosensitive material No. 201,photosensitive material No. 301, photosensitive material No. 301,photosensitive material No. 401, chlorhexidine gluconate solution,cresol, chloramine-T, chlorxylenol, chlorcresol, chlorphenesin,chlorhexidine, chlorobutanol, resorcin acetate, salicylic acid, sodiumsalicylate, domiphen bromide, zinc pyrithione, zinc pyrithione solution,sorbic acid, potassium sorbate, thiantol, thioxolone, thimol, thiram,dehydroacetic acid, sodium dehydroacetate, trichlorocarbanilide,trichlorohydroxydiphenyl ether, isobutyl para-oxybenzoate, isopropylpara-oxybenzoate, ethyl para-oxybenzoate, butyl para-oxybenzoate, propylpara-oxybenzoate, benzyl para-oxybenzoate, methyl para-oxybenzoate,sodium methyl para-oxybenzoate, parachlorphenol, sodiumpara-phenolsulfonate (dihydrate), halocarban, phenoxyethanol, phenol,hexachlorophane, mononitroguaiacol, sodium mononitroguaiacol,para-dimethylaminostyryl heptyl methyl triazolinium, lauryltrimethylammonium trichlorophenoxide, oxyquinoline sulfate, oxyquinolinephosphate, and resorcin are suggested as specific examples of theantiseptic agents, anti-fungal agents, and anticorrosive agents.

Skincare cosmetics possessing excellent affinity to the skin and capableof imparting superior wetness and smoothness are obtained by combiningthe above-described cosmetics of the present invention with thefollowing various raw materials.

The various raw materials used in skincare cosmetics are exemplified bythe above-mentioned anionic surface active agents, nonionic surfaceactive agents, pH-adjusting agents, antiseptic agents, anti-fungalagents, anticorrosive agents, etc., as well as by avocado oil, almondoil, olive oil, cacao butter, sesame oil, wheat germ oil, safflower oil,shea butter, turtle oil, tung oil, persic oil, castor oil, grape seedoil, macadamia nut oil, mink oil, egg yolk oil, Japan wax, coconut oil,rosehip oil, hydrogenated oils, and other oils and fats; orange roughyoil, carnauba wax, candelilla wax, spermaceti wax, jojoba oil, montanwax, beeswax, lanolin, and other waxes; liquid paraffin, Vaseline,paraffin, cerisin, microcrystalline wax, squalane, and otherhydrocarbons; lauric acid, myristic acid, palmitic acid, stearic acid,oleic acid, behenic acid, undecylenic acid, oxystearic acid, linolicacid, lanolic acid, synthetic fatty acids, and other higher fatty acids;ethyl alcohol, isopropyl alcohol, lauryl alcohol, cetyl alcohol,cetostearyl alcohol, stearyl alcohol, oleyl alcohol, behenyl alcohol,lanolin alcohol, hydrogenated lanolin alcohol, hexyldecanol,octyldodecanol, isostearyl alcohol, and other alcohols; cholesterol,dihydrocholesterol, phytosterol, and other sterols; ethyl linolate,isopropyl myristate, lanolin fatty acid isopropyl ester, hexyl laurate,myristyl myristate, cetyl myristate, octyldodecyl myristate, decyloleate, octyldodecyl oleate, hexyldecyl dimethyloctanoate, cetylisooctanoate, cetyl palmitate, glycerin trimyristate, glycerintri(caprylate/caprate), propylene glycol dioleate, glycerintriisostearate, glycerin triisooctanoate, cetyl lactate, myristyllactate, diisostearyl malate, and other fatty acid esters; glycerin,propylene glycol, 1,3-butylene glycol, polyethylene glycol, sodiumd,1-pyrrolidonecarbonate, sodium lactate, sorbitol, sodium hyaluronate,and other humectants; cationic surface active agents; betaine-type,amino acid-type, imidazoline-type, lecitin-type and other amphotericsurface active agents; iron oxides and other colored pigments, zincoxides, titanium oxides, zirconium oxides, and other white pigments,mica, talc, sericite, and other extender pigments; dimethylpolysiloxane,methylphenylpolysiloxane, octamethyltetracyclosiloxane,decamethylcyclopentasiloxane, polyether-modified silicone oils,amino-modified silicone oils, and other silicone oils; demineralizedwater; carrageenan, alginic acid, gum arabic, traganth, pectin,starches, xantham gum, polyvinyl alcohol, polyvinyl pyrrolidone, sodiumpolyacrylate, polyethylene glycol, and other thickeners;silicone-acrylic copolymer, silicone resins, acrylic polymers, and othercoating-forming agents; and, furthermore, UV absorbers, anti-microbialagents, anti-inflammatory agents, antiperspirants, fragrances,antioxidants, and propellants. In addition, hand creams, skin creams,foundations, eye shadows, facial cleansers, and body shampoos aresuggested as specific examples of the skincare cosmetics.

In addition, when the cosmetics of the present invention are used ashair care cosmetics, combining them with the above-mentioned anionicsurface active agents, nonionic surface active agents, pH-adjustingagents, antiseptic agents, anti-fungal agents, and anticorrosive agents,as well as with film-forming agents, antifreeze agents, oils,emulsifying agents, lubricants, anti-dandruff agents, antioxidants,chelating agents, UV absorbers, fragrances, colorants, and various otherraw materials makes it possible to obtain hair care cosmetics exhibitingexcellent adhesion to hair and capable of imparting superiormoisturizing properties and smoothness to it. Specifically, thefilm-forming agents are exemplified by polymers of (meth)acrylicradical-polymerizable monomers and copolymers with silicone compounds,poly(N-acylalkyleneimine), poly(N-methylpyrrolidone), non-functionalsilicone resins and silicone resins modified with fluorine-containingorganic groups and amino groups. There are no particular limitations onthe antifreeze agents, however, in general, suggested agents includeethanol, isopropyl alcohol, 1,3-butylene glycol, ethylene glycol,propylene glycol, and glycerin. Oils commonly used in cosmetics can beused as the oils. Microcrystalline wax, paraffin wax, spermaceti wax,beeswax, japan wax, sugarcane wax, and other waxes and their mixtures;liquid paraffin, α-olefin oligomers, squalane, squalene, and otherhydrocarbon oils or their mixtures; cetanol, stearyl alcohol, isostearylalcohol, hydrogenated castor oil-derived alcohols, behenyl alcohol,lanolin alcohol, and other linear or branched, saturated or unsaturated,unsubstituted or hydroxy-substituted higher alcohols or their mixtures,palmitic acid, myristic acid, oleic acid, stearic acid, hydroxystearicacid, isostearic acid, behenic acid, castor oil fatty acids, coconut oilfatty acids, tallow fatty acids, and other linear or branched, saturatedor unsaturated, unsubstituted or hydroxy-substituted higher fatty acidsor their mixtures, olive oil, coconut oil, rapeseed oil, palm oil, palmkernel oil, castor oil, hydrogenated castor oil, peanut oil, tallow,hydrogenated tallow, jojoba oil, hydrogenated jojoba oil, monostearicacid glyceride, monooleic acid glyceride, dipalmitic acid glyceride,trimyristic acid glyceride, oleyl oleate, isostearyl isostearate,palmityl behenate, isopropyl palmitate, stearyl acetate,dihydroxystearic acid ester, and other esters, linear, branched, orcyclic low molecular weight silicone oils, amino-modified silicone oils,fatty acid-modified silicone oils, alcohol-modified silicone oils,polyether-modified silicone oils, phosphoric acid (salt)-containingsilicone oils, sulfuric acid (salt)-containing silicone oils,fluorine-modified alkyl-containing silicone oils, alkyl-modifiedsilicone oils, epoxy-modified silicone oils and other silicone oils,high molecular weight silicones, raw rubber-like or thermoplasticsilicone resins soluble in solvents and liquid at room temperature, ortheir mixtures, are suggested as their representative examples. Thesilicones are preferably latex emulsions, the emulsifying agentsincluding, for instance, agents commonly used in the past, such asglycerin monostearate, sorbitan monopalmitate, polyoxyethylene cetylether, polyoxyethylene stearic acid ester and polyoxyethylene sorbitanmonolaurate. Hexylene glycol, polyethylene glycol 600, sodiumpyroglutamate, and glycerin are suggested as the humectants. Theanti-dandruff agents are exemplified by sulfur, selenium sulfide, zincpyridium-1-thiol-N-oxide, salicylic acid,2,4,4′-trichloro-2′-hydroxydiphenyl ether, and 1-hydroxy-2-pyridonecompounds. BHA, BHT, and γ-oryzanol are suggested as the antioxidants.The chelating agents are exemplified by ethylenediamine tetraacetate andethane-1-hydroxy-1,1-diphosphonic acid and its salts. The UV absorbersare exemplified by benzophenone derivatives represented by2-hydroxy-4-methoxybenzophenone, benzotriazole derivatives representedby 2-(2′-hydroxy-5′-methylphenyl)benzotriazole, cinnamic acid ester,etc. Furthermore, preferred compounds include glycerin, propyleneglycol, dipropylene glycol, 1,3-butylene glycol and other polyhydricalcohols, monoalkyltrimethylammonium salts, dialkyldimethylammoniumsalts, and other quaternary ammonium salts, with suggested specificcompounds including stearyltrimethylammonium chloride,behenyltrimethylammonium chloride, distearyldimethylammonium chloride,dibehenyldimethylammonium chloride, and other cationic surface activeagents, or amphoteric surface active agents, squalane, lanolin,perfluoropolyether, cationic polymers, and other sensory propertyimprovers, propylene glycol, glycerin, sorbitol, and other humectants,methylcellulose, carboxyvinyl polymers, hydroxyethyl cellulose,polyoxyethylene glycol distearate, ethanol, and other viscosityadjusters, pearlizers, fragrances, colorants, dyes, propellants,vitamins, hair nourishing formulas, hormones, and other drugs,triclosan, trichlorocarban, and other anti-microbial agents, potassiumglycyrrhizinate, tocopherol acetate, and other anti-inflammatory agents,zinc pyrithion, octopyrox, and other anti-dandruff agents,methylparaben, butylparaben, and other antiseptic agents, atomizingagents, and other ingredients included in the Encyclopedia of ShampooIngredients (Micelle Press, 1985). In addition, shampoos, hair rinses,hair conditioners, hair treatments, setting lotions, blow-stylingformulas, hair sprays, styling foams, styling gels, hair liquids, hairtonics, hair creams, hair growth formulas, hair nourishing agents, andhair-dyeing agents are specifically suggested as the hair carecosmetics.

EXAMPLES

Below, the present invention is explained in detail by referring topractical examples. The viscosity values used in the applicationexamples were obtained at 25° C. The aqueous suspensions of cross-linkedsilicone particles and aqueous emulsions of oil containing cross-linkedsilicone particles were evaluated as described below.

Average Particle Size of Crosslinked Silicone Particles in AqueousSuspensions

A median diameter (particle size corresponding to 50% of the cumulativedistribution: 50% particle size) obtained by examining an aqueoussuspension using a laser diffraction particle size analyzer (modelLA-500, from Horiba, Ltd.) was used as the average particle size of thecross-linked silicone particles. Additionally, the particle size of 90%was designated as the 90% particle size.

Average Particle Size of Oil Droplets in Aqueous Emulsions

A median diameter (particle size corresponding to 50% of cumulativedistribution: 50% particle size) obtained by examining an aqueousemulsion using a laser diffraction particle size analyzer (model LA-500,from Horiba, Ltd.) was used as the average particle size of oildroplets. Additionally, the particle size of 90% was designated as the90% particle size.

Average Particle Size of Crosslinked Silicone Particles in AqueousEmulsions

An oil composition containing cross-linked silicone particles obtainedby removing water from an aqueous emulsion was examined under amicroscope to obtain an average value for the particle size of tencross-linked silicone particles.

Stability

After diluting an aqueous suspension or an aqueous emulsion with waterto a solid matter concentration of 50% by weight, 150 mL of it wasplaced in a 225-mL mayonnaise jar and left stand for two weeks at 50° C.Stability was evaluated by measuring the thickness of the water layerthat separated two weeks later. In addition, a smaller thicknessindicates superior stability.

Practical Example 1

94.8 parts by weight of a 400 mm²/s dimethylpolysiloxane having bothends of the molecular chain blocked by dimethylvinylsiloxy groups andcontaining 2.5% by weight of an approximately 20 mm²/s cyclicdimethylsiloxane oligomer mixture were uniformly mixed with 5.2 parts byweight (enough to set the molar ratio of silicon-bonded hydrogen atomsto vinyl groups in the above-mentioned dimethylpolysiloxane to 0.95) ofa 50 mm²/s copolymer of methylhydrogensiloxane and dimethylsiloxanehaving both ends of the molecular chain blocked by trimethylsiloxygroups (content of silicon-bonded hydrogen atoms=0.31% by weight).

Next, after adding an aqueous solution consisting of 0.5 parts by weightof sodium N-lauroyl-N-methyltaurine and 20 parts by weight of pure waterand emulsifying the mixture in a colloid mill, an aqueous emulsion of asilicone composition was prepared by diluting the mixture with 39 partsby weight of pure water.

Separately, an aqueous emulsion of a platinum catalyst with an averageparticle size of 0.3 μm was prepared by uniformly mixing 1 part byweight of a mixed solution of 1,3-divinyltetramethyldisiloxane complexof platinum in 1,3-divinyltetramethyldisiloxane and isopropyl alcoholwith an aqueous solution consisting of 1 part by weight of ion exchangewater and 0.01 parts by weight of the same ingredient as above, sodiumN-lauroyl-N-methyltaurine.

Next, after adding the above-mentioned aqueous emulsion of a platinumcatalyst (in a quantity sufficient to bring the amount of platinum metalin the silicone composition in weight units to 5 ppm) to theabove-mentioned aqueous emulsion of a silicone composition and uniformlymixing them, the mixture was left stand for one day so as to crosslinkthe silicone composition by means of a hydrosilylation reaction,yielding an aqueous suspension of cross-linked silicone particlescontaining a mixture of cyclic dimethylsiloxane oligomers. The stabilityof the resultant aqueous suspension and the average particle size of thecross-linked silicone particles in it were measured. The results areshown in Table 1.

Practical Example 2

94.8 parts by weight of a 400 mm²/s dimethylpolysiloxane having bothends of the molecular chain blocked by dimethylvinylsiloxy groups andcontaining 2.5% by weight of an approximately 20 mm²/s cyclicdimethylsiloxane oligomer mixture were uniformly mixed with 5.2 parts byweight (enough to set the molar ratio of silicon-bonded hydrogen atomsto vinyl groups in the above-mentioned dimethylpolysiloxane to 0.95) ofa 50 mm²/s copolymer of methylhydrogensiloxane and dimethylsiloxanehaving both ends of the molecular chain blocked by trimethylsiloxygroups (content of silicon-bonded hydrogen atoms=0.31% by weight).

Next, after adding an aqueous solution consisting of 0.5 parts by weightof sodium N-myristyl-N-methyltaurine and 20 parts by weight of purewater and emulsifying the mixture in a colloid mill, an aqueous emulsionof a silicone composition was prepared by diluting the mixture with 39parts by weight of pure water.

Separately, an aqueous emulsion of a platinum catalyst with an averageparticle size of 0.3 μm was prepared by uniformly mixing 1 part byweight of a mixed solution of 1,3-divinyltetramethyldisiloxane complexof platinum in 1,3-divinyltetramethyldisiloxane and isopropyl alcoholwith an aqueous solution consisting of 1 part by weight of ion exchangewater and 0.01 parts by weight of the same ingredient as above, sodiumN-myristyl-N-methyltaurine.

Next, after adding the above-mentioned aqueous emulsion of a platinumcatalyst (in a quantity sufficient to bring the amount of platinum metalin the silicone composition in weight units to 5 ppm) to theabove-mentioned aqueous emulsion of a silicone composition and uniformlymixing them, the mixture was left stand for one day so as to crosslinkthe silicone composition by means of a hydrosilylation reaction,yielding an aqueous suspension of cross-linked silicone particlescontaining a mixture of cyclic dimethylsiloxane oligomers. The stabilityof the resultant aqueous suspension and the average particle size of thecross-linked silicone particles in it were measured. The results areshown in Table 1.

Comparative Example 1

94.8 parts by weight of a 400 mm²/s dimethylpolysiloxane having bothends of the molecular chain blocked by dimethylvinylsiloxy groups andcontaining 2.5% by weight of an approximately 20 mm²/s cyclicdimethylsiloxane oligomer mixture were uniformly mixed with 5.2 parts byweight (enough to set the molar ratio of silicon-bonded hydrogen atomsto vinyl groups in the above-mentioned dimethylpolysiloxane to 0.95) ofa 50 mm²/s copolymer of methylhydrogensiloxane and dimethylsiloxanehaving both ends of the molecular chain blocked by trimethylsiloxygroups (content of silicon-bonded hydrogen atoms=0.31% by weight).

Next, after adding an aqueous solution consisting of 0.5 parts by weightof sodium lauryl sulfate and 20 parts by weight of pure water andemulsifying the mixture in a colloid mill, an aqueous emulsion of asilicone composition was prepared by diluting the mixture with 39 partsby weight of pure water.

Separately, an aqueous emulsion of a platinum catalyst with an averageparticle size of 0.3 μm was prepared by uniformly mixing 1 part byweight of a mixed solution of 1,3-divinyltetramethyldisiloxane complexof platinum in 1,3-divinyltetramethyldisiloxane and isopropyl alcoholwith an aqueous solution consisting of 1 part by weight of ion exchangewater and 0.01 parts by weight of the same ingredient as above, sodiumlauryl sulfate.

Next, after adding the above-mentioned aqueous emulsion of a platinumcatalyst (in a quantity sufficient to bring the amount of platinum metalin the silicone composition in weight units to 5 ppm) to theabove-mentioned aqueous emulsion of a silicone composition and uniformlymixing them, the mixture was left stand for one day so as to crosslinkthe silicone composition by means of a hydrosilylation reaction,yielding an aqueous suspension of cross-linked silicone particlescontaining a mixture of cyclic dimethylsiloxane oligomers. The stabilityof the resultant aqueous suspension and the average particle size of thecross-linked silicone particles in it were measured. The results areshown in Table 1.

Comparative Example 2

94.8 parts by weight of a 400 mm²/s dimethylpolysiloxane having bothends of the molecular chain blocked by dimethylvinylsiloxy groups andcontaining 2.5% by weight of an approximately 20 mm²/s cyclicdimethylsiloxane oligomer mixture were uniformly mixed with 5.2 parts byweight (enough to set the molar ratio of silicon-bonded hydrogen atomsto vinyl groups in the above-mentioned dimethylpolysiloxane to 0.95) ofa 50 mm²/s copolymer of methylhydrogensiloxane and dimethylsiloxanehaving both ends of the molecular chain blocked by trimethylsiloxygroups (content of silicon-bonded hydrogen atoms=0.31% by weight).

Next, after adding an aqueous solution consisting of 2.0 parts by weightof a 25% aqueous solution of sodium polyoxyethylene (2) lauryl sulfateand 28.5 parts by weight of pure water and emulsifying the mixture in acolloid mill, an aqueous emulsion of a silicone composition was preparedby diluting the mixture with 39 parts by weight of pure water.

Separately, an aqueous emulsion of a platinum catalyst with an averageparticle size of 0.3 μm was prepared by uniformly mixing 1 part byweight of a mixed solution of 1,3-divinyltetramethyldisiloxane complexof platinum in 1,3-divinyltetramethyldisiloxane and isopropyl alcoholwith an aqueous solution consisting of 0.6 parts by weight of ionexchange water and 0.04 parts by weight of the same ingredient as above,a 25% aqueous solution of sodium polyoxyethylene (2) lauryl sulfate.

Next, after adding the above-mentioned aqueous emulsion of a platinumcatalyst (in a quantity sufficient to bring the amount of platinum metalin the silicone composition in weight units to 5 ppm) to theabove-mentioned aqueous emulsion of a silicone composition and uniformlymixing them, the mixture was left stand for one day so as to crosslinkthe silicone composition by means of a hydrosilylation reaction,yielding an aqueous suspension of cross-linked silicone particlescontaining a mixture of cyclic dimethylsiloxane oligomers. The stabilityof the resultant aqueous suspension and the average particle size of thecross-linked silicone particles in it were measured. The results areshown in Table 1. TABLE 1 Practical Practical Comparative ComparativeExample 1 Example 1 Example 1 Example 2 Particle size of cross-linkedsilicone particles Average particle 4.7 4.8 4.9 5.1 size (μm) 90%particle size 8.6 8.7 8.6 8.9 (μm) Stability (mm) 5-8 5-8 5-8 5-8

Practical Example 3

18.02 parts by weight of a 400 mm²/s copolymer of dimethylsiloxane andmethylvinylsiloxane having both ends of the molecular chain blocked bydimethylvinylsiloxy groups (vinyl group content=1.18% by weight), 1.98parts by weight of a 55 mm²/s copolymer of methylhydrogensiloxane anddimethylsiloxane (content of silicon-bonded hydrogen atoms=0.48% byweight) having both ends of the molecular chain blocked bytrimethylsiloxy groups (in a quantity sufficient to bring the molarratio of the silicon-bonded hydrogen atoms to the vinyl groups in theabove-mentioned copolymer of methylvinylsiloxane and dimethylsiloxane to0.95), and 80 parts by weight of a 100 mm²/s dimethylpolysiloxane havingboth ends of the molecular chain blocked by trimethylsiloxy groups wereuniformly mixed.

Next, after adding an aqueous solution consisting of 0.5 parts by weightof sodium N-lauroyl-N-methyltaurine and 20 parts by weight of pure waterand emulsifying the mixture in a colloid mill, an aqueous emulsion of asilicone composition was prepared by diluting the mixture with 39 partsby weight of pure water.

Separately, an aqueous emulsion of a platinum catalyst with an averageparticle size of 0.3 μm was prepared by uniformly mixing 1 part byweight of a mixed solution of 1,3-divinyltetramethyldisiloxane complexof platinum in 1,3-divinyltetramethyldisiloxane and isopropyl alcoholwith an aqueous solution consisting of 1 part by weight of ion exchangewater and 0.01 parts by weight of the same ingredient as above, sodiumN-lauroyl-N-methyltaurine.

Next, after adding the above-mentioned aqueous emulsion of a platinumcatalys (in a quantity sufficient to bring the amount of platinum metalin the silicone composition in weight units to 5 ppm) to theabove-mentioned aqueous emulsion of a silicone composition and uniformlymixing them, the mixture was left stand for one day so as to crosslinkthe silicone composition by means of a hydrosilylation reaction,yielding an aqueous emulsion of dimethylpolysiloxane oil containingcross-linked silicone particles. The stability of the resultant aqueousemulsion, the average particle size of the cross-linked siliconeparticles, and the average particle size of the dimethylpolysiloxane oildroplets were measured. The results are shown in Table 2.

Practical Example 4

18.02 parts by weight of a 400 mm²/s copolymer of dimethylsiloxane andmethylvinylsiloxane having both ends of the molecular chain blocked bydimethylvinylsiloxy groups (vinyl group content=1.18% by weight), 1.98parts by weight of a 55 mm²/s copolymer of methylhydrogensiloxane anddimethylsiloxane (content of silicon-bonded hydrogen atoms=0.48% byweight) having both ends of the molecular chain blocked bytrimethylsiloxy groups (in a quantity sufficient to bring the molarratio of the silicon-bonded hydrogen atoms to the vinyl groups in theabove-mentioned copolymer of methylvinylsiloxane and dimethylsiloxane to0.95), and 80 parts by weight of a 100 mm²/s dimethylpolysiloxane havingboth ends of the molecular chain blocked by trimethylsiloxy groups wereuniformly mixed.

Next, after adding an aqueous solution consisting of 0.5 parts by weightof sodium N-myristyl-N-methyltaurine and 20 parts by weight of purewater and emulsifying the mixture in a colloid mill, an aqueous emulsionof a silicone composition was prepared by diluting the mixture with 39parts by weight of pure water.

Separately, an aqueous emulsion of a platinum catalyst with an averageparticle size of 0.3 μm was prepared by uniformly mixing 1 part byweight of a mixed solution of 1,3-divinyltetramethyldisiloxane complexof platinum in 1,3-divinyltetramethyldisiloxane and isopropyl alcoholwith an aqueous solution consisting of 1 part by weight of ion exchangewater and 0.01 parts by weight of the same ingredient as above, sodiumN-myristyl-N-methyltaurine.

Next, after adding the above-mentioned aqueous emulsion of a platinumcatalys (in a quantity sufficient to bring the amount of platinum metalin the silicone composition in weight units to 5 ppm) to theabove-mentioned aqueous emulsion of a silicone composition and uniformlymixing them, the mixture was left stand for one day so as to crosslinkthe silicone composition by means of a hydrosilylation reaction,yielding an aqueous emulsion of dimethylpolysiloxane oil containingcross-linked silicone particles. The stability of the resultant aqueousemulsion, the average particle size of the cross-linked siliconeparticles, and the average particle size of the dimethylpolysiloxane oildroplets were measured. The results are shown in Table 2.

Comparative Example 3

18.02 parts by weight of a 400 mm²/s copolymer of dimethylsiloxane andmethylvinylsiloxane having both ends of the molecular chain blocked bydimethylvinylsiloxy groups (vinyl group content=1.18% by weight), 1.98parts by weight of a 55 mm²/s copolymer of methylhydrogensiloxane anddimethylsiloxane (content of silicon-bonded hydrogen atoms=0.48% byweight) having both ends of the molecular chain blocked bytrimethylsiloxy groups (in a quantity sufficient to bring the molarratio of the silicon-bonded hydrogen atoms to the vinyl groups in theabove-mentioned copolymer of methylvinylsiloxane and dimethylsiloxane to0.95), and 80 parts by weight of a 100 mm²/s dimethylpolysiloxane havingboth ends of the molecular chain blocked by trimethylsiloxy groups wereuniformly mixed.

Next, after adding an aqueous solution consisting of 0.5 parts by weightof sodium lauryl sulfate and 20 parts by weight of pure water andemulsifying the mixture in a colloid mill, an aqueous emulsion of asilicone composition was prepared by diluting the mixture with 39 partsby weight of pure water.

Separately, an aqueous emulsion of a platinum catalyst with an averageparticle size of 0.3 μm was prepared by uniformly mixing 1 part byweight of a mixed solution of 1,3-divinyltetramethyldisiloxane complexof platinum in 1,3-divinyltetramethyldisiloxane and isopropyl alcoholwith an aqueous solution consisting of 1 part by weight of ion exchangewater and 0.01 parts by weight of the same ingredient as above, sodiumlauryl sulfate.

Next, after adding the above-mentioned aqueous emulsion of a platinumcatalys (in a quantity sufficient to bring the amount of platinum metalin the silicone composition in weight units to 5 ppm) to theabove-mentioned aqueous emulsion of a silicone composition and uniformlymixing them, the mixture was left stand for one day so as to crosslinkthe silicone composition by means of a hydrosilylation reaction,yielding an aqueous emulsion of dimethylpolysiloxane oil containingcross-linked silicone particles. The stability of the resultant aqueousemulsion, the average particle size of the cross-linked siliconeparticles, and the average particle size of the dimethylpolysiloxane oildroplets were measured. The results are shown in Table 2.

Comparative Example 4

18.02 parts by weight of a 400 mm²/s copolymer of dimethylsiloxane andmethylvinylsiloxane having both ends of the molecular chain blocked bydimethylvinylsiloxy groups (vinyl group content=1.18% by weight), 1.98parts by weight of a 55 mm²/s copolymer of methylhydrogensiloxane anddimethylsiloxane (content of silicon-bonded hydrogen atoms=0.48% byweight) having both ends of the molecular chain blocked bytrimethylsiloxy groups (in a quantity sufficient to bring the molarratio of the silicon-bonded hydrogen atoms to the vinyl groups in theabove-mentioned copolymer of methylvinylsiloxane and dimethylsiloxane to0.95), and 80 parts by weight of a 100 mm²/s dimethylpolysiloxane havingboth ends of the molecular chain blocked by trimethylsiloxy groups wereuniformly mixed. Next, after adding an aqueous solution consisting of2.0 parts by weight of a 25% aqueous solution of sodium polyoxyethylene(2) lauryl sulfate and 28.5 parts by weight of pure water andemulsifying the mixture in a colloid mill, an aqueous emulsion of asilicone composition was prepared by diluting the mixture with 39 partsby weight of pure water.

Separately, an aqueous emulsion of a platinum catalyst with an averageparticle size of 0.3 μm was prepared by uniformly mixing 1 part byweight of a mixed solution of 1,3-divinyltetramethyldisiloxane complexof platinum in 1,3-divinyltetramethyldisiloxane and isopropyl alcoholwith an aqueous solution consisting of 0.6 parts by weight of ionexchange water and 0.04 parts by weight of the same ingredient as above,a 25% aqueous solution of sodium polyoxyethylene (2) lauryl sulfate.

Next, after adding the above-mentioned aqueous emulsion of a platinumcatalys (in a quantity sufficient to bring the amount of platinum metalin the silicone composition in weight units to 5 ppm) to theabove-mentioned aqueous emulsion of a silicone composition and uniformlymixing them, the mixture was left stand for one day so as to crosslinkthe silicone composition by means of a hydrosilylation reaction,yielding an aqueous emulsion of dimethylpolysiloxane oil containingcross-linked silicone particles. The stability of the resultant aqueousemulsion, the average particle size of the cross-linked siliconeparticles, and the average particle size of the dimethylpolysiloxane oildroplets were measured. The results are shown in Table 2. TABLE 2Practical Practical Comparative Comparative Example 3 Example 4 Example3 Example 4 Particle size of dimethylpoly- siloxane oil droplets Averageparticle 4.0 4.3 4.3 4.5 size (μm) 90% particle size 7.4 8.4 7.5 8.0(μm) Particle size of cross-linked silicone particles Average particle3   3   3   3   size (μm) Stability (mm) 4-7 4-7 4-7 4-7

Practical Example 5

Skin care shampoo compositions (1) and (2), whose formulations arelisted in Table 3, were prepared using the aqueous suspension ofcross-linked silicone particles prepared in Practical Example 1 or theaqueous emulsion of dimethylpolysiloxane oil containing cross-linkedsilicone particles prepared in Practical Example 4. The sensoryproperties and stability in mixtures of the skin care shampoocompositions were evaluated in accordance with the following methods.The results are shown in Table 3.

Stability in Mixtures

Stability was evaluated by the appearance of the shampoo compositionimmediately after preparation and after one month's storage at 50° C.The evaluation results were tabulated in the following manner.

: The composition was uniform, with no changes noted.

Δ: Slight creaming noted in the upper portion.

x: Completely separated into two layers.

Sensory Properties

The skin care shampoo compositions were used to cleanse the forearms of5 panelists for 30 seconds, after which compositions were washed offunder running water. Next, their sensory properties were evaluated afterwiping off the moisture with a dry towel and drying the skin.

Comparative Example 5

Skin care shampoo compositions (3) and (4), whose formulations arelisted in Table 3, were prepared using the aqueous suspension ofcross-linked silicone particles prepared in Comparative Example 1 or theaqueous emulsion of dimethylpolysiloxane oil containing cross-linkedsilicone particles prepared in Comparative Example 4. The sensoryproperties and stability in mixtures of the skin care shampoocompositions were evaluated in the same manner as in Practical Example5. The results are shown in Table 3. TABLE 3 Practical Example 5Comparative Example 5 (1) (2) (3) (4) Composition % Sodium lauroylsarcosine 15.0 15.0 15.0 15.0 (30% aqueous solution) Disodium laurylsulfosuccinate 15.0 15.0 15.0 15.0 (27% aqueous solution) Aqueoussuspension 10.0 — — — (Practical Example 1) Aqueous suspension — — 10.0— (Comparative Example 1) Aqueous emulsion — 10.0 — — (Practical Example4) Aqueous emulsion — — — 10.0 (Comparative Example 4) Ion exchangewater 60.0 60.0 60.0 60.0 Results Stability in Immediately after ⊚ ⊚ ⊚ ⊚mixtures preparation At 50° C., 1 month ⊚ ⊚ Δ Δ later Sensory evaluationSmooth, Smooth, Somewhat Somewhat slick, with slick, with insufficientinsufficient excellent excellent smoothness, smoothness, moist feelmoist feel slightly dry feel slightly dry feel

INDUSTRIAL APPLICABILITY

The inventive aqueous suspension of cross-linked silicone particles andaqueous emulsion of oil containing cross-linked silicone particles arecharacterized by superior stability and by low environmental impact andminimal effects on the human body due to the use of special N-acyl-,N-hydrocarbon taurines or their salts as surface active agents. Suchinventive aqueous suspensions and aqueous emulsions are extremely usefulas cosmetic raw materials because of their superior compatibility withthe human body and superior functionality such as wetness andsmoothness.

1. Aqueous suspensions of cross-linked silicone particles comprising:(A) cross-linked silicone particles with an average particle size offrom 0.1 to 500 μm, (B) N-acyl-, N-hydrocarbon taurines represented bythe general formula (I);

(where R¹ and R² stand for unsubstituted or substituted monovalenthydrocarbon groups) and/or their salts, and (C) water.
 2. The aqueoussuspensions according to claim 1, wherein component (A) comprisescross-linked silicone particles containing non-crosslinkable oil.
 3. Theaqueous suspensions according to claim 1, wherein component (A) accountsfor from 25 to 80% by weight, component (B) accounts for from 0.001 to20% by weight, and component (C) accounts for from 5 to 75% by weight.4. Aqueous emulsions of oil containing cross-linked silicone particlescomprising: (A) cross-linked silicone particles with an average particlesize of from 0.1 to 500 μm, (D) oil, (B) N-acyl-, N-hydrocarbon taurinesrepresented by the general formula (I)

(where R¹ and R² stand for unsubstituted or substituted monovalenthydrocarbon groups) and/or their salts, and (C) water, with component(A) contained in droplets of component (D) dispersed in water.
 5. Theaqueous emulsions according to claim 4, wherein component (D), whichcontains component (A) accounts for from 25 to 90% by weight, component(B) accounts for from 0.001 to 20% by weight, and component (C) accountsfor from 5 to 75% by weight.
 6. Cosmetic raw materials comprising theaqueous suspensions according to claim
 1. 7. Cosmetic raw materialscomprising the aqueous emulsions according to claim
 4. 8. The aqueoussuspensions according to claim 1, wherein component (B) is selected fromthe group of sodium N-lauroyl methyl taurine, sodium N-myristoyl methyltaurine, sodium N-oleoyl methyl taurine, sodium N-stearoyl methyltaurine, sodium N-coconut fatty acid methyl taurine, potassium N-coconutfatty acid methyl taurine, magnesium N-coconut fatty acid methyltaurine, sodium N-palmitoyl methyl taurine, potassium N-stearoyl methyltaurine, potassium N-cetyloyl methyl taurine, and combinations thereof.9. The aqueous suspensions according to claim 1, wherein component (B)is further defined as a salt represented by the general formula

(where R³ stands for a hydrogen atom or an alkyl group, and M is analkali metal).
 10. The aqueous suspensions according to claim 9, whereinthe salt is selected from the group of sodium taurine, sodium N-methyltaurine, and combinations thereof.
 11. The aqueous emulsions accordingto claim 4, wherein component (B) is selected from the group of sodiumN-lauroyl methyl taurine, sodium N-myristoyl methyl taurine, sodiumN-oleoyl methyl taurine, sodium N-stearoyl methyl taurine, sodiumN-coconut fatty acid methyl taurine, potassium N-coconut fatty acidmethyl taurine, magnesium N-coconut fatty acid methyl taurine, sodiumN-palmitoyl methyl taurine, potassium N-stearoyl methyl taurine,potassium N-cetyloyl methyl taurine, and combinations thereof.
 12. Theaqueous emulsions according to claim 4, wherein component (B) is furtherdefined as a salt represented by the general formula

(where R³ stands for a hydrogen atom or an alkyl group, and M is analkali metal).
 13. The aqueous emulsions according to claim 12, whereinthe salt is selected from the group of sodium taurine, sodium N-methyltaurine, and combinations thereof.